package com.athuawei.lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 线程间的定制化通信
 * ～
 */
class Share {
    private int number = 0;

    //创建lock
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    //+1
    public void incr() throws InterruptedException {

        lock.lock();
        try{
            while(number != 0) {
                condition.await();
            }
            number++;
            System.out.println(Thread.currentThread().getName()
                    + " :: " + number);
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }

    //-1
    public void decr() throws InterruptedException {

        lock.lock();
        try{
            while(number != 1) {
                condition.await();
            }
            number--;
            System.out.println(Thread.currentThread().getName()
                    + " :: " + number);
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }
}

public class ThreadDemo2 {

    public static void main(String[] args) {
        Share share = new Share();
        new Thread(()->{
            for(int i = 0; i < 10; i++){
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"AA").start();

        new Thread(()->{
            for(int i = 0; i < 10; i++){
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"BB").start();

        new Thread(()->{
            for(int i = 0; i < 10; i++){
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"CC").start();
        new Thread(()->{
            for(int i = 0; i < 10; i++){
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"DD").start();
    }
}
